Cartridge for the Commodore 64 that packs a punch

Ted Fried's MicroCore Labs Projects which include microsequencer-based FPGA cores and emulators for the 8088, 8086, 8051, 6502, 68000, Z80, Risc-V, and also Typewriter and EPROM Emulator projects. MCL51, MCL64, MCL65, MCL65+, MCL68, MCL86, MCL86+, MCL86jr, MCLR5, MCLZ8, MCL6809, XTMax

A fast & simple MOS 6502 CPU emulator written in C++

Sidekick64: A Versatile Software-Defined Cartridge for the C64, C128, C16, plus/4, and VIC20

Commodore 64 emulator written in Rust

Millfork: a middle-level programming language targeting 6502- and Z80-based microcomputers and home consoles

A curated list of software emulators and simulators of PCs, home computers, mainframes, consoles, robots and much more...

Commodore 64 VIC-II 6567/6569 Replacement Project

SIDKick -- the first complete SID 6581/8580-drop-in-replacement that you can build yourself

high level programming language and compiler targeting 6502 machines such as the C-64 and CommanderX16

tapuino

TeensyROM is a ROM Emulator, Fast Loader, MIDI and Internet cartridge for Commodore64/128

A Java framework for building highly customizable PETSCII-enabled BBS, accessible from Commodore 64/128

A Scala Commodore 64, 128, VIC20, CBM2 and SuperCPU emulator

A cross platform tool to convert images to c64 format.

Open Hardware 8Kb Cartridge for the Commodore 64

Disassembly (CA65) of the Commodore 64 port of the seminal space-sim Elite, by Ian Bell / David Braben.

Tetris in 6502 for the Commodore 64

source code for Worms? by David S. Maynard

Commodore-64 simulator in pure Python